/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.euphoria.core.client.type;



import com.bff.gaia.unified.sdk.extensions.euphoria.core.client.operator.base.Operator;

import com.bff.gaia.unified.sdk.values.TypeDescriptor;



import java.util.Optional;



/**

 * A collection of interfaces which allows access to {@link TypeDescriptor types} of implementing

 * {@link Operator Operators} properties.

 *

 * <p>Note that there is no input typing interface. That is on purpose since all the transformations

 * are chained together and type of input(s) equals to types of previous transform output(s). Source

 * transforms needs to know which type of elements are producing explicitly.

 */

public class TypeAware {



  /** Returns {@link TypeDescriptor} of this operator output type. */

  public interface Output<OutputT> {



    Optional<TypeDescriptor<OutputT>> getOutputType();

  }



  /** Returns {@link TypeDescriptor} of this operator key type. */

  public interface Key<KeyT> {



    Optional<TypeDescriptor<KeyT>> getKeyType();

  }



  /** Returns {@link TypeDescriptor} of this operator value type. */

  public interface Value<ValueT> {



    Optional<TypeDescriptor<ValueT>> getValueType();

  }

}